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Densification behavior, microstructure evolution, and wear property of TiC
nanoparticle reinforced AlSi10Mg bulk-form nanocomposites prepared by selective laser
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Selective laser melting (SLM), due to its unique additive manufacturing processing
philosophy, demonstrates a high potential in producing bulk-form nanocomposites with novel
and enhanced properties. In this study, the nanoscale TiC particle reinforced
AlSi10Mg nanocomposite parts were produced by SLM process. The influence of
“laser energy per unit length” (LEPUL) on densification behavior, microstructural
evolution, and wear property of SLM-processed nanocomposites was studied. It showed that using an
insufficient LEPUL of 250 J/m lowered the SLM densification due to the balling effect and
the formation of residual pores. The highest densification level (>98% theoretical
density) was achieved for SLM-processed parts processed at the LEPUL of 700 J/m. The TiC
reinforcement in SLM-processed parts experienced a structural change from the
standard nanoscale particle morphology (the average size 75–92 nm) to the relatively
coarsened submicron structure (the mean particle size 161 nm) as the applied LEPUL
increased. The nanostructured TiC reinforcement was generally maintained within a wide
range of LEPUL from 250 to 700 J/m and the dispersion state of nanoscale TiC reinforcement
was homogenized with increasing LEPUL. The sufficiently high densification rate combined
with the uniform distribution of nanoscale TiC reinforcement throughout the matrix led to
the considerably low coefficient of friction of 0.38 and wear rate of
2.76 × 10−5 mm3 N−1 m−1 for SLM-processed
at 700 J/m. Both the insufficient SLM densification response at a relatively low LEPUL of
250 J/m and the disappearance of nanoscale reinforcement at a high LEPUL of 1000 J/m
lowered the wear performance of SLM-processed nanocomposite parts.
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